{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{3}{cccc}}
\hline\hline
                    &\multicolumn{2}{c}{(1)}  &\multicolumn{2}{c}{(2)}  &\multicolumn{2}{c}{(3)}           \\
                    &\multicolumn{2}{c}{}     &\multicolumn{2}{c}{}     &\multicolumn{2}{c}{}              \\
                    &        mean&          sd&        mean&          sd&           b         &           p\\
\hline
Below median prior school&        0.44&        0.50&        0.49&        0.50&       -0.05         &      (0.20)\\
From Kampala        &        0.21&        0.41&        0.20&        0.40&        0.01         &      (0.85)\\
mother\_raised       &        0.12&        0.33&        0.13&        0.34&       -0.01         &      (0.68)\\
One or both parents professionals&        0.16&        0.37&        0.19&        0.39&       -0.03         &      (0.40)\\
Received a bursary  &        0.18&        0.38&        0.15&        0.36&        0.02         &      (0.45)\\
\hline
Observations        &         256&            &         309&            &         565         &            \\
\hline\hline
\end{tabular}
}
